TG313 - (GE) Steam Turbine Valve Maintenance

2 days - 1.3 Continuing Education Units Awarded
On-Site-Only

Improve the effectiveness of your GE steam turbine valve maintenance activities.
REDUCE: Outage Durations, Outage Extensions, Work Duplication, and Rework.
INCREASE: Outage Intervals, Reliability, Availability, and Productivity.

Greater unit reliability and availability can be achieved through proper routine valve maintenance activity. Quality valve maintenance outages are the result of thorough job planning and a complete understanding of the equipment, specifications, and procedures.

This Seminar has been designed for GE steam turbine facility foremen, supervisors, mechanics, engineers, and all other plant personnel who are concerned with increasing the effectiveness and reducing the cost of steam turbine valve maintenance outages.

OBJECTIVES
Upon successful completion of this Seminar the participant will have:

1. Identify safety precautions that must be adhered to during a turbine steam valve inspection and repair outage.
2. Describe the various inspections performed during disassembly of turbine steam valves.
3. Describe the procedures for cleaning and inspecting the turbine steam valve components.
4. Describe the impact of the various types of defects on turbine efficiency and reliability.
5. Describe the criteria used to evaluate turbine steam valve component defects.
6. Describe the various repair methods for defective steam valve component conditions.

HPC is prepared to instruct this Seminar as developed by equipment-experienced instructors that offer a broad range of practical experience on numerous types and sizes of steam turbine-generators.

Seminar OUTLINE

1. Introduction
   1. Function of Valve
   2. Main Steam Valve Arrangement and Terminology
   3. Safety Precautions
2. Steam Valve Disassembly
   1. GE Main Stop Valves
   2. GE Control Valves
   3. GE Reheat Stop Valves
   4. GE Intercept Valves
   5. GE Combined Reheat Stop Valves
3. Steam Valve Cleaning
   1. Methods
      1. Grit Blast Cleaning
      2. Stoning
      3. Wire Brushing
      4. Strap Lapping
      5. Honing
4. Steam Valve Inspection
   1. Inspection Procedures
      1. Valve Discs
      2. Valve Seats
      3. Contact Checks
      4. Stems
      5. Crosshead Guide and Bushings
      6. Steam Strainers
      7. Linkages
      8. Valve Closing Springs
      9. Valve Studs and Bolts
      10. Valve Body's
5. Steam Valve Reassembly
   1. Procedures
   2. Valve Stud Tightening
6. Inspection and Report Forms
7. Seminar Conclusion